Jest Error: Cannot set base providers. After Angular v13 upgrade using 'ng test'

My solution was to remove the setup-jest.ts file, since import 'jest-preset-angular/setup-jest'; is already executed by @angular-builders/jest.

I've come across the same issue. It seems that ESM support with Angular 13 is not released yet. https://thymikee.github.io/jest-preset-angular/docs/next/guides/angular-13+

However, there's a PR already merged (https://github.com/thymikee/jest-preset-angular/pull/1122) that presumably should fix the issue.

In order to run Jest testing suite using the native ng test command, you had to install the @angular-builders/jest package.

If you take a look at the node_modules/@angular-builders/jest/dist/jest-config/setup.js you will see that the builder is importing jest-preset-angular/setup-jest for you.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
require("jest-preset-angular/setup-jest");
//# sourceMappingURL=setup.js.map

Now, you probably have a jest.config.js file within your project, and your configuration is likely to have the following property:

A list of paths to modules that run some code to configure or set up the testing framework before each test file in the suite is executed.

setupFilesAfterEnv: ['<rootDir>/setup-jest.ts'],

Which means that jest will import setup-jest.ts before all your test, now within the setup-jest.ts you will likely have

import 'jest-preset-angular/setup-jest';

This is where you are importing jest-preset-angular/setup-jest twice.

To prevent this, either remove the import from the setup-jest.ts file or the file name from the setupFilesAfterEnv array.